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Math Help - Help Please (Homework :P)

  1. #1
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    Exclamation Help Please (Homework :P)

    Sita puts 5 balls in Box A and 4 Balls in Box B.
    The balls are numbered.


    Box A-balls numbered 1-5
    Box B-balls numbered 1-4

    What is the probability that the sum of the numbers on the balls is less than 5?



    Please help me thankyou
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  2. #2
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    I have worked out that the answer is maybe 3/10.........do you think this is correct?
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  3. #3
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    Quote Originally Posted by Nat077 View Post
    I have worked out that the answer is maybe 3/10.........do you think this is correct?
    The possible combinations of 3=
    Sample space: (BoxA, BoxB): (1,1); (1,2); (1,3); (2;1); (2,2); (3,1).

    Total combinations= 20.

    P(X<5)= 6/20= 3/10.
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  4. #4
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    Hello, Nat077!

    I have worked out that the answer is maybe 3/10
    Do you think this is correct?
    Yes, I do!

    There are: . 5 \times 4 \:=\:20 outcomes.
    . . And six of them have a sum less than 5: . 1,2),\1,3),\;(2,1),\2,2),\3,1)" alt="(1,1),\1,2),\1,3),\;(2,1),\2,2),\3,1)" />

    P(\text{sum}< 5) \:=\:\frac{6}{20} \:=\:\frac{3}{10}

    . . . Good work!

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